3. Drive functions
3−41
Festo P.BE−CPX−CMA X−CONTROL−EN en 0908NH
Static identification With static identification, characteristics are ascertained
which have an effect on the behaviour of the system at the
beginning and end of the movement as well as on that of the
standstill control. This includes static friction of the drive and
the valve characteristics in the range of the mid−position
(valve hysteresis).
Dynamic
identification With dynamic identification, the maximum attainable speed
as well as the acceleration and deceleration ability of the
drive system are ascertained.
This identification must be carried out in the case of axes
which should move at maximum speed (automatic profile).
If the mass changes considerably during operation, identifica
tion should be carried out
both with and without the work
piece.
The dynamic part of the identification can be deactivated.
This is important for cases where the structure cannot with
stand dynamic stress.
No maximum values for the system speed and acceleration
are determined without the dynamic identification having
been carried out. For tasks with an automatic profile",
a
warning (W17) is output and the task is carried out with a
free profile" and the valid specified values.
The user determines the moving behaviour of the axis with
the acceleration values. It might be necessary to manually
optimise these values.
Carrying out identification
Only for pneumatic drives with incremental position measur
ing system (e.g. type DNCI−...):
Homing must be carried out before the identification run.
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